Yeah they need to be replaced. JET chevy ran a diagnostic on them a few months ago for the guy I bought it from and they said the #8 injector was bad and since then the white smoke has gotten worse so I’m assuming another has cracked as well.
It sounds like injectorsdirect aren’t a bad source as long as you buy the Remanufactured and NOT the refurbished. And agreed, for a job this involved you replace them all at once.
I was told the injectors were originally replaced at 90k miles and now the truck has 190k so it seems about time to do it again. Thanks for the responses.